<pre class="shiki github-dark shaku"><code>// please complete the implementationclass EventEmitter { constructor(){ this.events = {} } subscribe(eventName, callback) { let event = this.events[eventName] || { subs:[] } const that = this const sub = { release: function(){ const subs = that.events[eventName].subs const subIndex = subs.findIndex(item=&gt; this === item) subs.splice(subIndex,1) }, callback } event.subs.push(sub) this.events[eventName] = event return sub } emit(eventName, ...args) { const subs = this.events?.[eventName]?.subs if(!subs){ return } subs.forEach(sub=&gt;{ sub.callback(...args) }) }}</code></pre>

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There is Event Emitter in Node.js, Facebook once had its own implementation but now it is archived. You are asked to create an Event Emitter Class con…